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<pre><span class="comment"> /****************************************************************************
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 #include &lt;QtGui&gt;

 #include &quot;piecesmodel.h&quot;

 PiecesModel::PiecesModel(QObject *parent)
     : QAbstractListModel(parent)
 {
 }

 QVariant PiecesModel::data(const QModelIndex &amp;index, int role) const
 {
     if (!index.isValid())
         return QVariant();

     if (role == Qt::DecorationRole)
         return QIcon(pixmaps.value(index.row()).scaled(60, 60,
                          Qt::KeepAspectRatio, Qt::SmoothTransformation));
     else if (role == Qt::UserRole)
         return pixmaps.value(index.row());
     else if (role == Qt::UserRole + 1)
         return locations.value(index.row());

     return QVariant();
 }

 void PiecesModel::addPiece(const QPixmap &amp;pixmap, const QPoint &amp;location)
 {
     int row;
     if (int(2.0*qrand()/(RAND_MAX+1.0)) == 1)
         row = 0;
     else
         row = pixmaps.size();

     beginInsertRows(QModelIndex(), row, row);
     pixmaps.insert(row, pixmap);
     locations.insert(row, location);
     endInsertRows();
 }

 Qt::ItemFlags PiecesModel::flags(const QModelIndex &amp;index) const
 {
     if (index.isValid()) {
         return (Qt::ItemIsEnabled | Qt::ItemIsSelectable
               | Qt::ItemIsDragEnabled | Qt::ItemIsSelectable);
     }

     return Qt::ItemIsDropEnabled;
 }

 bool PiecesModel::removeRows(int row, int count, const QModelIndex &amp;parent)
 {
     if (parent.isValid())
         return false;

     if (row &gt;= pixmaps.size() || row + count &lt;= 0)
         return false;

     int beginRow = qMax(0, row);
     int endRow = qMin(row + count - 1, pixmaps.size() - 1);

     beginRemoveRows(parent, beginRow, endRow);

     while (beginRow &lt;= endRow) {
         pixmaps.removeAt(beginRow);
         locations.removeAt(beginRow);
         ++beginRow;
     }

     endRemoveRows();
     return true;
 }

 QStringList PiecesModel::mimeTypes() const
 {
     QStringList types;
     types &lt;&lt; &quot;image/x-puzzle-piece&quot;;
     return types;
 }

 QMimeData *PiecesModel::mimeData(const QModelIndexList &amp;indexes) const
 {
     QMimeData *mimeData = new QMimeData();
     QByteArray encodedData;

     QDataStream stream(&amp;encodedData, QIODevice::WriteOnly);

     foreach (QModelIndex index, indexes) {
         if (index.isValid()) {
             QPixmap pixmap = qVariantValue&lt;QPixmap&gt;(data(index, Qt::UserRole));
             QPoint location = data(index, Qt::UserRole+1).toPoint();
             stream &lt;&lt; pixmap &lt;&lt; location;
         }
     }

     mimeData-&gt;setData(&quot;image/x-puzzle-piece&quot;, encodedData);
     return mimeData;
 }

 bool PiecesModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
                                int row, int column, const QModelIndex &amp;parent)
 {
     if (!data-&gt;hasFormat(&quot;image/x-puzzle-piece&quot;))
         return false;

     if (action == Qt::IgnoreAction)
         return true;

     if (column &gt; 0)
         return false;

     int endRow;

     if (!parent.isValid()) {
         if (row &lt; 0)
             endRow = pixmaps.size();
         else
             endRow = qMin(row, pixmaps.size());
     } else
         endRow = parent.row();

     QByteArray encodedData = data-&gt;data(&quot;image/x-puzzle-piece&quot;);
     QDataStream stream(&amp;encodedData, QIODevice::ReadOnly);

     while (!stream.atEnd()) {
         QPixmap pixmap;
         QPoint location;
         stream &gt;&gt; pixmap &gt;&gt; location;

         beginInsertRows(QModelIndex(), endRow, endRow);
         pixmaps.insert(endRow, pixmap);
         locations.insert(endRow, location);
         endInsertRows();

         ++endRow;
     }

     return true;
 }

 int PiecesModel::rowCount(const QModelIndex &amp;parent) const
 {
     if (parent.isValid())
         return 0;
     else
         return pixmaps.size();
 }

 Qt::DropActions PiecesModel::supportedDropActions() const
 {
     return Qt::CopyAction | Qt::MoveAction;
 }

 void PiecesModel::addPieces(const QPixmap&amp; pixmap)
 {
     beginRemoveRows(QModelIndex(), 0, 24);
     pixmaps.clear();
     locations.clear();
     endRemoveRows();
     for (int y = 0; y &lt; 5; ++y) {
         for (int x = 0; x &lt; 5; ++x) {
             QPixmap pieceImage = pixmap.copy(x*80, y*80, 80, 80);
             addPiece(pieceImage, QPoint(x, y));
         }
     }
 }</pre>
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